CN102082042A - Relay control circuit with current detecting function - Google Patents
Relay control circuit with current detecting function Download PDFInfo
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- CN102082042A CN102082042A CN2010105556398A CN201010555639A CN102082042A CN 102082042 A CN102082042 A CN 102082042A CN 2010105556398 A CN2010105556398 A CN 2010105556398A CN 201010555639 A CN201010555639 A CN 201010555639A CN 102082042 A CN102082042 A CN 102082042A
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- 238000005070 sampling Methods 0.000 claims abstract description 19
- 238000002955 isolation Methods 0.000 claims abstract description 11
- 239000003990 capacitor Substances 0.000 claims description 16
- 238000001514 detection method Methods 0.000 claims description 13
- 230000005611 electricity Effects 0.000 claims description 6
- 240000007320 Pinus strobus Species 0.000 claims description 5
- 230000005622 photoelectricity Effects 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 1
- 238000004353 relayed correlation spectroscopy Methods 0.000 description 1
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Abstract
A relay control circuit with current detecting function comprises a current control circuit, a current sampling circuit and a current signal isolating and detecting circuit, wherein the current control circuit is used for controlling connection and disconnection of high-voltage current by low-voltage current, the current sampling circuit pair is connected in the high-voltage current circuit in series and samples current by diodes, and the current signal isolating and detecting circuit is used for photoelectric isolation output of current output by the current sampling circuit by an optical coupler U1; and the relay control circuit mainly solves the problems of no current feedback and non-universality of detecting circuit for alternating-current or direct-current of different voltage. The designed circuit is arranged on a pair of wiring terminals for not only being used as output for controlling other equipments, but also being used for detecting the existence of the loop current of the controlled equipments; and the power supply of the controlled equipments can be direct-current or alternating-current, and is applicable at the voltage of 24V to 220V.
Description
Technical field
The present invention relates to a kind of control relay circuit with current sense function, it is integrated mainly to utilize diode and optocoupler to realize that on same pair of wire connection terminals output and input detect, and belongs to electric field.
Background technology
The control of Industry Control repeat circuit is a kind of control circuit commonly used, and it can control big electric current, high voltage by small-signal.Common control relay circuit can only be exported control signal, and controlled circuit is not detected, and can not feed back the state of controlled device.And the existing interchange of voltage of the object of industrial circle relay control also has direct current, and voltage swing is also different, and (24V ~ 220V), usual current detection circuit can not be general.
Summary of the invention
The purpose of this invention is to provide a kind of control relay circuit with current sense function.
The present invention mainly solves control relay circuit does not have the problem of current feedback and the problem that the testing circuit under the different voltage condition of AC/DC can not be general.
Technical scheme of the present invention is: a kind of control relay circuit with current sense function, constitute by current control circuit, current sampling circuit, current signal isolation detection circuit, current control circuit is used to finish the break-make control of low tension to high-tension electricity, current sampling circuit is connected in the high-tension electricity circuit, finish the current signal sampling by diode, the current signal isolation detection circuit carries out photoelectricity by optocoupler U1 to the electric current of exporting in the current sampling circuit and isolates output.
Current control circuit mainly by relay as control element, at relay output pin series current sample circuit; Current sampling circuit is by 4 diode D2 ~ D5, and series connection back reverse parallel connection constitutes in twos, and resistance R 2 also is in parallel with two groups of diodes; The current signal isolation detection circuit is made of optocoupler U1, resistance R 1 and filter circuit, the input of optocoupler U1 is in series with resistance R 1, the signal output part of optocoupler U1 is parallel with filter circuit, and resistance R 1 is the current-limiting resistance of optocoupler U1, and resistance R 2 provides bypass for little electric current; Filter circuit is made of capacitor C 1 and resistance R 3, capacitor C 1 and resistance R 3 ground connection in parallel, and capacitor C 1 strobes when detecting AC signal, and resistance R 3 provides discharge channel for capacitor C 1; Optocoupler U1 is two-way optocoupler.
Using method is: power supply and power consumption equipment in J1 and the series connection of J2 end, and the break-make of relay K 1 control circuit, the diode D1 that is connected in parallel on relay K 1 coil two ends is used to absorb the self inductance current that relay coil produces.4 diode D2 ~ D5 have been connected at relay K 1 output pin, in twos series connection back reverse parallel connection.When the closing of contact of relay K 1, its two ends just have voltage (0.7V*2=1.4V) when having electric current to flow through diode, and this voltage can drive optocoupler U1, and the signal of exporting from optocoupler can be received by microcontroller.Because diode drop is constant, so this circuit goes for the detection of different voltage.Be provided with the diode of two groups of reverse parallel connections, and optocoupler U1 is two-way optocoupler,, can detects alternating current again so this circuit both can detect the direct current of any direction.Resistance R 1 is the current-limiting resistance of optocoupler.Resistance R 2 provides bypass for little electric current.Capacitor C 1 strobes when detecting AC signal, and resistance R 3 provides discharge channel for capacitor C 1.
Description of drawings
Accompanying drawing 1 is a kind of layout plan with control relay circuit of current sense function.
Among the figure: 1, current control circuit 2, current sampling circuit 3, current signal isolation detection circuit.
Embodiment
The present invention is further illustrated below in conjunction with drawings and Examples.
As shown in Figure 1, a kind of control relay circuit with current sense function, constitute by current control circuit 1, current sampling circuit 2, current signal isolation detection circuit 3, current control circuit 1 is used to finish the break-make control of low tension to high-tension electricity, current sampling circuit 2 is connected in the high-tension electricity circuit, finish current sampling by diode, current signal isolation detection circuit 3 carries out photoelectricity by optocoupler U1 to the electric current of exporting in the current sampling circuit 2 and isolates output
Current control circuit 1 mainly by relay K 1 as control element, at the output pin series current sample circuit 2 of relay K 1; Current sampling circuit 2 is by 4 diode D2 ~ D5, and series connection back reverse parallel connection constitutes in twos, and resistance R 2 also is in parallel with two groups of diodes; Current signal isolation detection circuit 3 is made of optocoupler U1, resistance R 1 and filter circuit, the input of optocoupler U1 is in series with resistance R 1, the signal output part of optocoupler U1 is parallel with filter circuit, and resistance R 1 is the current-limiting resistance of optocoupler U1, and resistance R 2 provides bypass for little electric current; Filter circuit is made of capacitor C 1 and resistance R 3, capacitor C 1 and resistance R 3 ground connection in parallel, and capacitor C 1 strobes when detecting AC signal, and resistance R 3 provides discharge channel for capacitor C 1; Optocoupler U1 is two-way optocoupler.
Using method is: be example with the marine searchlight, 220v power supply and searchlight in J1 and the series connection of J2 end, relay K 1 is held input voltage by the engine-room control console button at RELAY, the break-make of control circuit, the diode D1 that is connected in parallel on relay K 1 coil two ends is used to absorb the self inductance current that relay coil produces.Output pin in relay K 1 has connected 4 diode D2 ~ D5, in twos series connection back reverse parallel connection.The closing of contact as relay K 1D, its two ends just have voltage (0.7V*2=1.4V) when having electric current to flow through diode, this voltage can drive optocoupler U1, VCC end be loaded as 5v or the 3v power supply identical with the power supply of the interior single-chip microcomputer of engine-room control console, can be received by the singlechip controller in the engine-room control console from the high level signal of optocoupler signal output part CURRENT output, light corresponding indicator light on the control desk, if when the searchlight that uses has been broken, the loop disconnects, the signal of optocoupler signal output part CURRENT output is a low level just, and the lamp went out or control desk sends the indication of reporting to the police in corresponding indication.Because diode drop is constant, so this circuit goes for the detection of different voltage.Be provided with the diode of two groups of reverse parallel connections, and optocoupler U1 is two-way optocoupler,, can detects alternating current again so this circuit both can detect the direct current of any direction.Resistance R 1 is the current-limiting resistance of optocoupler.Resistance R 2 provides bypass for little electric current.Capacitor C 1 strobes when detecting AC signal, and resistance R 3 provides discharge channel for capacitor C 1.
Claims (6)
1. control relay circuit with current sense function, constitute by current control circuit (1), current sampling circuit (2), current signal isolation detection circuit (3), it is characterized in that: current control circuit (1) is used to finish the break-make control of low tension to high-tension electricity, current sampling circuit (2) is connected in the high-tension electricity circuit, finish the current signal sampling by diode, current signal isolation detection circuit (3) carries out photoelectricity by optocoupler U1 to the current signal of exporting in the current sampling circuit (2) and isolates output.
2. a kind of control relay circuit with current sense function according to claim 1 is characterized in that: described current control circuit (1) mainly by relay K 1 as control element, at the output pin series current sample circuit (2) of relay K 1.
3. a kind of control relay circuit with current sense function according to claim 1 is characterized in that: described current sampling circuit (2) is made of 4 diode D2 ~ D5 and resistance R 2, reverse parallel connection after wherein 4 diode D2 ~ D5 connect in twos; Resistance R 2 and two groups of diodes are in parallel.
4. a kind of control relay circuit according to claim 1 with current sense function, it is characterized in that: described current signal isolation detection circuit (3) is made of optocoupler U1, resistance R 1 and filter circuit, the input of optocoupler U1 is in series with resistance R 1, the signal output part of optocoupler U1 is parallel with filter circuit, resistance R 1 is the current-limiting resistance of optocoupler U1, and resistance R 2 provides bypass for little electric current.
5. a kind of control relay circuit according to claim 4 with current sense function, it is characterized in that: described filter circuit is made of capacitor C 1 and resistance R 3, capacitor C 1 and resistance R 3 ground connection in parallel, capacitor C 1 strobes when detecting AC signal, and resistance R 3 provides discharge channel for capacitor C 1.
6. a kind of control relay circuit with current sense function according to claim 4 is characterized in that: described optocoupler U1 is two-way optocoupler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105556398A CN102082042A (en) | 2010-11-24 | 2010-11-24 | Relay control circuit with current detecting function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105556398A CN102082042A (en) | 2010-11-24 | 2010-11-24 | Relay control circuit with current detecting function |
Publications (1)
| Publication Number | Publication Date |
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| CN102082042A true CN102082042A (en) | 2011-06-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105556398A Pending CN102082042A (en) | 2010-11-24 | 2010-11-24 | Relay control circuit with current detecting function |
Country Status (1)
| Country | Link |
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| CN (1) | CN102082042A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102495267A (en) * | 2011-12-13 | 2012-06-13 | 合肥工业大学 | Alternating current detection circuit and automatic power-off circuit with zero power-off power consumption |
| CN106406169A (en) * | 2016-09-06 | 2017-02-15 | 许继电气股份有限公司 | I/O device for direct-current control protection system |
| CN107221146A (en) * | 2017-05-15 | 2017-09-29 | 国网天津市电力公司 | A kind of automatic tee modular circuit |
| CN112034744A (en) * | 2020-07-14 | 2020-12-04 | 深圳日辉达电源股份有限公司 | Intelligent control circuit for power supply of Internet of things |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2295289Y (en) * | 1997-05-27 | 1998-10-21 | 铁道部第一勘测设计院 | Intelligent current-variable charging control device |
| CN2800611Y (en) * | 2005-05-23 | 2006-07-26 | 王文杰 | Phase-failure protection device for three-phase power supply |
| CN1871786A (en) * | 2003-10-21 | 2006-11-29 | 松下电器产业株式会社 | Facilities equipment communication circuit |
| CN101354573A (en) * | 2008-08-29 | 2009-01-28 | 美的集团有限公司 | Circuit of pulping machine |
| CN201378193Y (en) * | 2009-04-10 | 2010-01-06 | 陈恒光 | Ground wire detecting device |
| CN201868333U (en) * | 2010-11-24 | 2011-06-15 | 浙江海洋学院 | Relay control circuit with current detection function |
-
2010
- 2010-11-24 CN CN2010105556398A patent/CN102082042A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2295289Y (en) * | 1997-05-27 | 1998-10-21 | 铁道部第一勘测设计院 | Intelligent current-variable charging control device |
| CN1871786A (en) * | 2003-10-21 | 2006-11-29 | 松下电器产业株式会社 | Facilities equipment communication circuit |
| CN2800611Y (en) * | 2005-05-23 | 2006-07-26 | 王文杰 | Phase-failure protection device for three-phase power supply |
| CN101354573A (en) * | 2008-08-29 | 2009-01-28 | 美的集团有限公司 | Circuit of pulping machine |
| CN201378193Y (en) * | 2009-04-10 | 2010-01-06 | 陈恒光 | Ground wire detecting device |
| CN201868333U (en) * | 2010-11-24 | 2011-06-15 | 浙江海洋学院 | Relay control circuit with current detection function |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102495267A (en) * | 2011-12-13 | 2012-06-13 | 合肥工业大学 | Alternating current detection circuit and automatic power-off circuit with zero power-off power consumption |
| CN106406169A (en) * | 2016-09-06 | 2017-02-15 | 许继电气股份有限公司 | I/O device for direct-current control protection system |
| CN107221146A (en) * | 2017-05-15 | 2017-09-29 | 国网天津市电力公司 | A kind of automatic tee modular circuit |
| CN112034744A (en) * | 2020-07-14 | 2020-12-04 | 深圳日辉达电源股份有限公司 | Intelligent control circuit for power supply of Internet of things |
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Application publication date: 20110601 |